Theoretical estimates of equilibrium Fe-isotope fractionations from vibrational spectroscopy

Schauble, E. A.; Rossman, George R.; Taylor, Hugh P.

doi:10.1016/s0016-7037(01)00600-7

Cited by 227 publications

(240 citation statements)

References 42 publications

(42 reference statements)

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“…The origin and significance of these unusual values are unclear. Using reduced isotopic partition function ratios for FeS 2 and Fe(II)-aquachloro complexes determined previously (Polyakov, 1997;Polyakov and Mineev, 2000;Schauble et al, 2001;Polyakov et al, 2007), the isotope fractionation factors  between FeS 2 and FeCl 4 2-or Fe(H 2 O) 6 2+ are ~1.0015 at 350°C. Although these positive fractionation factors are opposite to the kinetic isotope fractionation during FeS precipitation, either from Fe(II) aq solutions at room temperature (Butler et al, 2005) or from silicate melt at magmatic temperatures (Schuessler et al, 2007), it may explain the occurrence of positive A different interpretation involves sulphidisation of Fe-oxide minerals for the origin of these grains, as positive δ 56 Fe values have so far been described mainly from BIFs in the Archaean rock record Dauphas et al, 2004;Rouxel et al, 2005;Whitehouse and Fedo, 2007).…”

Section: Origin Of Rounded Pyrite With Highly Positive δ 56 Fe Valuesmentioning

confidence: 96%

Multiple sulphur and iron isotope composition of detrital pyrite in Archaean sedimentary rocks: A new tool for provenance analysis

Hofmann

Bekker

Rouxel

et al. 2009

Earth and Planetary Science Letters

114

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Multiple S (δ 34 S and δ 33 S) and Fe (δ 56 Fe) isotope analyses of rounded pyrite grains from 3.1 to 2.6 Ga conglomerates of southern Africa indicate their detrital origin, which supports anoxic surface conditions in the Archaean. Rounded pyrites from Meso-to Neoarchaean gold and uranium-bearing strata of South Africa are derived from both crustal and sedimentary sources, the latter being characterised by non-mass dependent fractionation of S isotopes

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Section: Origin Of Rounded Pyrite With Highly Positive δ 56 Fe Valuesmentioning

confidence: 96%

Multiple sulphur and iron isotope composition of detrital pyrite in Archaean sedimentary rocks: A new tool for provenance analysis

Hofmann

Bekker

Rouxel

et al. 2009

Earth and Planetary Science Letters

114

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“…In order to interpret natural data measured in pyrite, they assumed that the β-factors for mackinawite would be similar to those for troilite, since both are Fe(II) monosulphides. Blanchard et al (2009) used first principle calculations (Schauble et al, 2001(Schauble et al, ,2006 to discuss the pyrite β-factors given by the technique from Polyakov and co-workers. Fig.…”

Section: Comparison With Calculated Predictionsmentioning

confidence: 99%

“…6 shows the temperature dependence of equilibrium Δ 56 Fe Fe(II)-sulphide for pyrite, troilite and our experiment. β-factors for Fe(II) aq are from Schauble et al (2001) and Anbar et al (2005). β-factors for pyrite and troilite are from Blanchard et al (2009), Polyakov andMineev (2000) and Polyakov et al (2007).…”

Section: Comparison With Calculated Predictionsmentioning

confidence: 99%

Fe isotope exchange between Fe(II)aq and nanoparticulate mackinawite (FeSm) during nanoparticle growth

Guilbaud

Butler

Ellam

et al. 2010

Earth and Planetary Science Letters

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“…During partial melting, Fe(III) is more incompatible in olivine and pyroxene than Fe(II) is. Both theoretical calculations and experimental determinations show that Fe(III)-bearing phases tend to be enriched in the heavy isotopes of iron compared to Fe(II)-bearing phases (Polyakov and Mineev, 2000;Schauble et al, 2001;Schuessler et al, 2007;Shahar et al, 2008). Such equilibrium isotope fractionation between Fe(III) and Fe(II) may explain, at least in part, the heavy iron isotope composition of MORBs and OIBs relative to that of chondrites and other planetary basalts (Dauphas et al, 2009a).…”

Section: Introductionmentioning

confidence: 96%

Iron isotope fractionation in planetary crusts

Wang

Moynier

Dauphas

et al. 2012

Geochimica et Cosmochimica Acta

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We present new high precision iron isotope data (d 56 Fe vs. IRMM-014 in per mil) for four groups of achondrites: one lunar meteorite, 11 martian meteorites, 32 howardite-eucrite-diogenite meteorites (HEDs), and eight angrites. Angrite meteorites are the only planetary materials, other than Earth/Moon system, significantly enriched in the heavy isotopes of Fe compared to chondrites (by an average of +0.12& in d 56 Fe). While the reason for such fractionation is not completely understood, it might be related to isotopic fractionation by volatilization during accretion or more likely magmatic differentiation in the angrite parent-body. We also report precise data on martian and HED meteorites, yielding an average d 56 Fe of 0.00 ± 0.01&. Stannern-trend eucrites are isotopically heavier by +0.05& in d 56 Fe than other eucrites. We show that this difference can be ascribed to the enrichment of heavy iron isotopes in ilmenite during igneous differentiation. Preferential dissolution of isotopically heavy ilmenite during remelting of eucritic crust could have generated the heavy iron isotope composition of Stannern-trend eucrites. This supports the view that Stannern-trend eucrites are derived from main-group eucrite source magma by assimilation of previously formed asteroidal crust.These new results show that iron isotopes are not only fractionated in terrestrial and lunar basalts, but also in two other differentiated planetary crusts. We suggest that igneous processes might be responsible for the iron isotope variations documented in planetary crusts.

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Theoretical estimates of equilibrium Fe-isotope fractionations from vibrational spectroscopy

Cited by 227 publications

References 42 publications

Multiple sulphur and iron isotope composition of detrital pyrite in Archaean sedimentary rocks: A new tool for provenance analysis

Multiple sulphur and iron isotope composition of detrital pyrite in Archaean sedimentary rocks: A new tool for provenance analysis

Fe isotope exchange between Fe(II)aq and nanoparticulate mackinawite (FeSm) during nanoparticle growth

Iron isotope fractionation in planetary crusts

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